Ruling · Rādhāṣṭamī · 1900

Sunday 2 September

Determinatein Perth, under the Rashtriya Panchang method. Clear of every threshold by 456 minutes.

Decide it for

PerthDelhiKolkataSingaporeSydneyJersey City

31°57′ S 115°52′ E · Australia/Perth · GeoNames 2063523

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Sunday 2 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:53  12:41 madhyāhna ends
11:0511:2911:5312:1712:4113:0513:29

48 of 48 minutes covered

Midday of Monday 3 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:52  12:40 madhyāhna ends
11:0411:2811:5212:1612:4013:0413:28

0 of 48 minutes covered

Aṣṭamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 03:24 on Sun 2 Sep to 04:16 on Mon 3 Sep.

    1900-09-01T19:23:33Z → 1900-09-02T20:16:21Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:53–12:41 on the 2nd, 11:52–12:40 on the 3rd.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 2nd and 0 of 48 on the 3rd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 27353 s

  5. 05

    Ruling

    Rādhāṣṭamī, Perth, 1900: Sunday 2 September.

    confidence: determinate

Say it like this

In Perth, Rādhāṣṭamī 1900 falls on Sunday 2 September. Aṣṭamī runs from 03:24 on Sun 2 Sep to 04:16 on Mon 3 Sep and covers all of madhyāhna that midday.

ahargana.org/perth/festivals/1900/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 2 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 2 Sep
compat-drikpanchangComparison profileSun 2 Sep
No institution has a recorded ruling for Perth.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/radhashtami · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 1stCoveredMadhyāhna 2ndCoveredRuled
Los Angeles11:24 → 12:1611:2948 min11:2848 min1 Sep
Chicago13:24 → 14:1611:260 min11:2648 min2 Sep
Jersey City14:24 → 15:1611:320 min11:3248 min2 Sep
Port of Spain15:24 → 16:1611:420 min11:4248 min2 Sep
London19:24 → 20:1611:360 min11:3648 min2 Sep
Durban20:54 → 21:4611:020 min11:0248 min2 Sep
Dubai23:05 → 23:5711:360 min11:3548 min2 Sep
Delhi00:45 → 01:3711:480 min11:4848 min2 Sep
Kolkata00:45 → 01:3711:030 min11:0348 min2 Sep
Singapore02:19 → 03:1111:360 min11:3548 min2 Sep
Sydney05:24 → 06:1611:320 min11:3148 min2 Sep
Suva07:19 → 08:1111:380 min11:3748 min2 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
radhashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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